Given E∘Cr3+/Cr=−0.72,E∘Fe2+/Fe=−0.42V The potential for the cell, Cr|Cr3+(0.1M)||Fe2+(0.01M)|Fe is:
A
−0.26V
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B
0.26V
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C
0.339V
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D
−0.339V
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Solution
The correct option is B0.26V E∘cell=−0.42−(−0.72)=+0.30V 2Cr(s)+3Fe2+(0.01M)⇌2Cr3+(0.1M)+3Fe(s) Q=[Cr3+]2[Fe2+]3=[0.1]2[0.01]2=104 According to Nernst equation, E=E∘−0.059nlog10Q =0.30−0.0596log104(∵b=6) =0.261V.